Wireless receiving apparatus.



- "MW a I v g m4 1. s. LEACH.

.' WIRELESS RECEIVING APPARATUS.

APPLICATION FILED DE( 2. 12 I913.

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JOSEPH S. BEACH, 01 BROOKLYN, YORK.

WIRELESS RECEIVING APPARATUS.

Specification of Letters Patent.

Patented Apr. 20, 1915.

Application filed December 12, 1913. Serial No. 806,168.

To all whom it may concern Be it known that 1,-JOSEPH S. LEACH, asubject of the King of Great Britain, and a resident of Brooklyn, in thecounty of Kings and State of NewYork, have invented certain new anduseful Improvements in Wireless Receiving A paratus, of which thefollowing is a speo' cation.

The invention relates to receiving apparatus, more particularly such asis employed in the wireless transmission of intelligence.

The apparatus is of the telephone type of receiver; and with such, theintensit of the si nal emitted by the receiver isa notion 0 the distancebetween the stations.

It is, therefore, desirable to provide means whereby the receivingapparatus may be ad justed to properly respond to the signal sent; andthe present invention has for its object to provide such receivinapparatus with a simple and accurate a justing device by means of whichthe distance between the diaphragm and magnet poles may be suitablyvaried to correspond to the different distances.

The nature of the' invention will be best understood when described inconnection with the accompanying drawings, in which- Figure 1 is avertical section through the receiving apparatus, and Fig. 2 is a planthereof.

Similar characters of reference designate corresponding parts throughoutthe several views.

Referring to the drawings, 10 designates a suitable casing, adapted toinclose the mechanism and is fitted with a diaphragm 11 held thereto bya cap 12, of insulation, as is well understood.

13 and 14: designate the terminal connections which are electricallyconnected to windings or coils 15 surrounding permanently magnetizedpolepieces 16 cooperating'with the diaphragm 11.

It is the object of the present invention to afford means whereby thedistance between the poles 16 of the magnets and the inner faceofdiaphragm 11 may be varied to corre-. spond to the distances betweencommunicating stations. To this end, the said magnets are not directlysecured to the casing 10 but are carried by a, plate 17 to which theyare rigidly attached. This plate, in turn, is fixedly secured to one endof'a rod or shaft 18 provided at its outer end with a micrometer threadand guided in an elongated bearing 19 to prevent wabbling of said shaft.The bearing is fixed to the casing and the outer end of the shaft fits arecess 20 provided therefor in a bracket 21 also fixed to the saidcasing and extending over the end of sa 1d shaft. Between the outer faceof the bearmg 19 and the inner face of the bracket 21 and about thethreaded end ofthe rod 18 1s mounted a lever 22, havin a nut 23 threadedto fit the said threade end of the rod 18. Suitable friction washers 24are included between'the nut 23 and the lever 22 and therespectivebracket and bearing. To prevent turning of the plate 17, a pin 25 isprovided, the same extending inwardly from the casing into the saidplate. As the lever 22 is moved, rod 18 is correspondingly advanced orretracted and ca-rrles with it the magnets to accordingly vary thedistance between the oles 16 and the diaphragm-11.

In view 0 the elongated bearmg 19, the

. afford a uniform and desired degree of reciprocation of said magnets.The design and arrangement of the entire structure is such that therewill be no wabbling'of the magnets and their position relative to thediaphragm may be accurately maintained and reproduced after variousadjustments, all of which is particularly desirable as well as necessaryin connection with the 'use to which the apparatus is to be put.

I claim: 7

- 1. In receiving apparatus of the character set forth: a casing;suitable magnetic means therein, and a diaphragm cooperating therewith;and means to vary the distance between said magnetic means and saiddiaphragm, comprising a reciprocable shaft connected with said magneticmeans to reciprocate the same, said shaft being threaded at its outerend, an elongated bearing for said shaft and secured to the said casing,means to prevent turning of said magnetic means, a'threaded nut engagingthe threaded end of said shaft, and a lever connected therewith to movesaid nut whereby the said shaft is reciprocated accordingly.

2. In receiving apparatus of the'character set forth: a casing; suitablemagnetic means therein, and a diaphragm cooperating therewith; and'meansto vary the distance between said magnetic means and said diaphragm,comprising .a reciprocable shaft connected with said ma etic means toreciprocate the same, said s aft being threaded at its outer end, abracket extending over said casing and provided with a recess for thethreaded end of said shaft, an elongated bearing forsaid shaft andsecured to the said casing, means to prevent turning of said magneticmeans, a threaded nut engaging the threaded end of said shaft, and a 10lever connected therewith to move said nut whereby thesaid shaft isreciprocated accordingly.

Signed at New York, in the county of N ew York, and State of NewYork,this 3rd day ofDeeember A. D. 1913.

JOSEPH s. LEAGH.

- Witnesses:

EDWARD W. F. MAMMEN, E. Gr. RYAN. I

